Plug-switch.



F.1. RAVLIN @I I. LOFGREN.

PLUG SWITCH.

APPLICATION FILED D EC. 3. |914.

1,169,426, I Patented l1311.25, 1916.

2 SHEETS-SHEET I.

F. 1. RAVLIN 11. LOFGREN.

PLUG SWITCH.

APPL1cAT1oN FILED Dec. 3. 1914. 1

Pubmed 1.111.213,1916.

2 SHEETS-SHEET 2.

slillll'lllfll STATES PATENT onirica.;

[o all fwL'orie Winry concern Be it known that We, 'FREDERICK J. RAvmN and JOHN LOFGREN, citizens of the 'United States, residing at Chicago, in the county of Ckand Stat'ebf Illinois, have invented certainmewf and useful Improvements m Plug-Switches, ofwhich lthefollowing is a 1 'Our invention relates toviniprovexnents 1n plug "switcl1`es,and in some of its features more particularly to pl'uo switclies for three l Iwire circuits, particularly adapted for three- Iphase wiring systems.I

Among theugeneral objects of your inventionv is to 'proyide a,` weather proof switch socket construction' that is simple, durable, efficient, "easily installed and well adapted for installation in placesy where the switch isr liable to, vreceive' roughl usage.

In thedrawing-f l Figure 1:` isal side elevation of the switch complete, showing its socket, andplug meinbers; 'Fig'. '2.is a vertical sectionon line 2--2 of Figs. 1 ande. Fig. 3 is a plan view of the socket construction; Fig. el is a vertical cross section on linee-fl of Fig. y3, including a section offLthe plug;,l1`ig.y 5 is a cross section ,on line 55 of Figi/t and Fig.4 6 a cross sect1on,tlirou`gh the plug .on line 6--6 of Inthe'dijawings 10 indicates in general a socket or receptacle member and 11 a coperating'f4 lug' member.

12 in' icatesa conduit, of` metal or .other` rigid materialwith respect to. which the f switch Iiste lbelocated.,

The socket "lO'colnprises a receptacle or ycasing 13, of instal,

whichl the ,body 'telescopesz 14 is shaped to 4provide an odd number, say 3, of radiating ,chambers 1G, the sdefaud back wallsllof-each. forming substantially threesides'ofja rectangle and meeting on verticalj'unction lines 17, so that the several sections form. a star, or radiatingchamber A socket. The top of this body section. is open,

` being preferably formed in .but its bottom is partially closed bye. wall 18 that yhastherein a star opening 19 shaped similarly to,but larger than, a cross section of the plug 11, shown in Fig. S, there the4 juncture of two of the radiating lobes of the opening 19 a finger 20 that is, adapted to fit in and cooperate with the slot 21 in the plug 11 so that the plug must always be fitted one way 4r'rino-2201311101r .LBAVLIN AND .roi-ru` romania, or emesso, ILLINOIS.

of each other,

` having a lower body por tion l'm'andanpoverlapping head 15 into The body pari;-

PLUG-S'NVITCH.

.Specitication of Letters Patent.' PntentedJan, 25, 1916, Applicaties mea December e, 1914. ser1a1`No.s75,27e.

provided .with ears 22, having l l support.y Within said body receptacle I pro# vide a multiple piece insulating base 25, composed of sections 26 that :may be duplicates Imeeting at their edges onlines 27 that are continuations of the junction -line 17 o1 the casing body and each recessed 'as at 2S, along its inward face from its lower edge to a top wall portion 29, so that jointly such structures may provide a tlnee-chambered star socket. preferably extends from the bottom 18 of the casing body to a point somewhat above its upper edge. Each insulating base section has mounted on-the rear wall of its recess a contact spring 32, suitably anchored at its lower end sethat its free' end may project upwardly in the recess, the anchored end of said spring being suitably connected as'by a binding screwwBB or otherwise, with a metal-` lic plate 34: that lies in a recess 35 made ex'- teriorly in said back wall of the base section,

In height, the insulating base so that an appropriate wire may readily be connected to the spring member 32. To receive suchwiring a groove 36 1s made exteriorly in the back wall of the section` leadl ing from its top to the recess 35. In order to prevent possibility of short oilrcuiting the metallic structures appurtenant to vthe recess upon the metal shell' member lfl an insulating block 37 is preferably' riveted oi other-` wise secured to the back Awall of each charm ber 1li of the casing body.

'The head structure 15 of the casing'lprof` vides a` skirt Ll0 to interiit neatly around the' 'radiating chambers 14 of the body member, he secured thereto (mainly for pur` and `may I poses of shipment) as by one or' more screws 11. The head is closed at its top in ademe 42 in size approximating the circle that may be inscribed within the .intersections 17 of l the body chambers, and 'from the dome to'4 the centers ol the extensions thatoverlie the `body` chambers 16 there are run downwardly .and outwardly curving ribsfl, theside walls made therein a larrer orifice-l1), andai biishthat interiorly thel arched ribs 48 aiord pliance a susceptibility to easy adequate wiring spaces leading from the inspection that is very desirable.

repair and central dome over the wire channels 36 of The plug 11 employed 1n connection withl vthe several insulating base sections, while the socket may be. of any desired material, 70

the wall portions all form shoulders that preferablywood, having on each'of its three overlie and preferably bear upon the respeclobes or leaves 59 a'contaet plate 60`secured tive insulating base sections, thereby so by screws 6l each taking intoa bushing 62 snugly enseoneing insulating base sections that is inserted throiigh a hole bored from in the receptacle that they are held by conthe opposite angle.- The plates have binding'v tact and friet-ion against displacement in SCIeWS G3 in recessed portions 64, and-t0 any direction when the easing parts are assembled, although each insulating base section is freerom any extraneous connection with the casing that would prevent its ready Clalm 1S 2- I removal when the casing parts are disas- 1 In il Plll SWICll, the COlllbiIlatiOifl o f a sembled. Ears 46 are preferably cast incasing provl lng a number of radiating tegral with the shirt Ll0 and extend upward CllilmbelS mOIe than tW0, f1I1.1I lSulilt1 n base so that their scre\\'-rerei\'ing orifices for the mOlUltBd theft/111 and retallled 1n position by attaching screws 4S may of the contiguous parts, for

duits 65 in the handle.

convenient acthe body and head members of the casing il Plug PI'OVlllflg il llle Humber 0f I ilflllll'lg are connected to a 'support they are very Wmgsg and Cooperatlllg Cfmtacls 0n the firmly related to each other and are not PFOPllale faces Qf sind Wmgs; A liable to become separateil or displaced un 2- A three Wlle Plug SWltCh der the rough usage which is often attendant upon the foreingof the plup,` into the socket.

The head l5 is so related to the iixed conduit l2 that it may, upon occasion, be mg "It thell' fldlomlllg edgesf slipped up upon the conduit. to be ont of llslll' Pl'omdmg il Slmllfu luralll'fy of mdl the way. 'lo this end', the extremity of the conduit is externally screw threaded as at 12; the dome of the head memberl sections radially dis osed, recessed from one ing 50 is provided, having an external bear ing annulus 5l to 'receive the dome and a, stern 52 that passes through the dome opening 49, this bushing being" internally screw head member having a wiring orifice,l and said base sections respectively carrying threaded for engagement with the threads incl Springs l5on wel? inwardly (Bing 12. llx'ternal ly, also, the stem 52 is threadback 'flllS- f 3. In a structure scribed the combinationo a two piece receptacle' casing 'having its upper and lower sections teleseopically inter lating base .therein having anend opening socket't he upper casinghaving therein a Wir-v ed and a nut 53 1s screwed down thereon to engage the top surface of the dome and make ti ght connection therewith. i

It will be seen'that in assembling the structure upon a conduit having a threaded end, and wiring the several switch-leaves 32 to the respective wires brought in through the conduit 1 2, the bushing 50 may be screwed into place, -th en the nut 53 unserewed and, together with the head-15, slipped up onto` the .conduit out of the way.

casing member with a conduit, said means threaded, projecting through said orifice and b@ above the level contact with the casing, having a like num-' i ber of recesses jointly-forming a socket, con-4 cess, and it will be apparent that when both ICS 011 the blCl Walls 0f Sad recesses, and;

receptacle comprising more than two msulatmg ibase end along their con renting faces, and meeti a receptacle. i

ating chambers respective y receiving and holding against radial andfdownwardadisf.; 5 has placement the said base seetions,ga head member telescopically interlittting with said casing body and a'ording endb'earin'gsor' 10,01 y

the upper ends ot' said basesections,` said ofthe character des..

ing o rifice,'and means to connect the upperj flanged below ythe'A top ofthe casing, anda Having described our invention, what we se f soi-y eomprisnga stem, externally and internally l The several insulatingbaseseetions are than nuten,tlletlu'euded Stem.abevethe-cusing.

pulled out of. their-:respective pockets and connected to-the'several'electric wires that have been led in and snipped o' to approxieeptaele casingha ving its4 upper and lower` Vrinrtely d'zheprepeelengzth.;` the wired tion 14, after which the head member 15 is by eontaetmivinsaid casing sectionstelescopically interfitted,insulatingbase members are assembled in the bodysecI-basesectigps arranged ywithin and pos1t1oned sections, said brought back to position and secured to its base sections having recesses'in their con-V .support and then'tlie body member 1 4 telefronting tt'aees jointly to form a socket and scoped thereinto and in. turn secured to its being endwise reinm'rable from the lower support. Of course this facility for easy easing section' when said easing sections are' separation of parts. a nd the utilization of separated, the upper casing having therein duplicate parts 1n therseetional construction of the insulating base, gveswto the apupper casing member with a conduit,said .i`

a wiring orifice, and means tojconncct the .751 these the plug wires are led through conlhln la structure of lthe'cln'ua-cterde'- Q scribed the combination ot'al two piecev ren l casing, and a nut on the threaded stem above hands.l

means comprising a. stem, externally and a three-lobed plug, having a. groove 21, and 10 internally threaded, lrojecting through said bearing a, Contact on each lobe.

orifice and lnnged elow the top of the In testimony whereof we hereunto set our the4 casing. FREDERICK J. RAVLIN.

,54. A three Wire piu switch comprising o JOHN LOFGREN. v

shell having' n three-1o ed, star o enmg,w1th In the presence. o

'a projection 20; a. three-cham ered socket GEO. T. MAY, Jr.,

base having a contact in each chamber, and l MARY Y. AILEN. 

